class_docstr: CALIOP v3 HDF4 reader.
class_docstr_tok: ["CALIOP","v3","HDF4","reader","."]
docstr: Get HDF4 filehandle.
docstr_tok: ["Get","HDF4","filehandle","."]
code: def get_filehandle(self):
      """Get HDF4 filehandle."""
      if os.path.exists(self.filename):
          self.filehandle = SD(self.filename, SDC.READ)
          logger.debug("Loading dataset {}".format(self.filename))
      else:
          raise IOError("Path {} does not exist.".format(self.filename))
  
file_path: satpy/satpy/readers/caliop_l2_cloud.py
imports: import logging
  import os.path
  import re
  from datetime import datetime
  from pyhdf.SD import SD, SDC
  from satpy.dataset import Dataset
  from satpy.readers.file_handlers import BaseFileHandler
label_desc: Use image node_id 4 for calling the HDF4BandReader obj's underlying member method code with example usage: obj.get_filehandle() without return types